#3687B2
Closest named color: Blue NCS (#118AB2). oklch(59.3% 0.102 235.5), rgb(54, 135, 178).
Aa
Black text reads best on this color (5.26:1).
About this color
#3687B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.102 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.017 away. Black text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.26:1 |
| White text | 3.98:1 |
Values
| HEX | #3687B2 |
| RGB | rgb(54, 135, 178) |
| HSL | hsl(201, 53%, 45%) |
| OKLCH | oklch(59.3% 0.102 235.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3687B2 | 3.98:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #3687B2 | 5.26:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #3687B2 text on white | 3.98:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #3687B2 text on black | 5.26:1 | AA | Lc -34.7 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE8
oklch(88.5% 0.025 236.9)
-
Step 300
300
#A5C6DA
oklch(80.9% 0.045 234.7)
-
Step 400
400
#73A8C8
oklch(70.6% 0.073 235.7)
-
Step 500
500
#4B92BA
oklch(63% 0.093 235.6)
-
Step 600
600 (this color)
#3687B2
oklch(59.3% 0.102 235.5)
-
Step 700
700
#1A688F
oklch(49.1% 0.095 236)
-
Step 800
800
#195574
oklch(42.7% 0.079 235.8)
-
Step 900
900
#1C465D
oklch(37.6% 0.061 235.6)
-
Step 950
950
#122937
oklch(26.9% 0.039 237.4)
#3687B2 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #7286B4 | 0.061 |
| Deuteranopia (no green cones) | #617AB1 | 0.051 |
| Tritanopia (no blue cones) | #009296 | 0.065 |
| Achromatopsia (no color) | #7F7F7F | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3687B2
#3687B2
oklch(59.3% 0.102 235.5)
- #AC6D3F
#AC6D3F
oklch(59.3% 0.101 55.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3687B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.017
- Steel Blue #4682B4 ΔE 0.019
- Cool Blue #4984B8 ΔE 0.021
- Off Blue #5684AE ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.032
- Teal Blue #01889F ΔE 0.039
- Cerulean #457B9D ΔE 0.041
- Water Blue #0E87CC ΔE 0.042
Use #3687B2 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.